Play-free rotary mounting

Abstract

A play-free rotary mounting for a drive roll held on stop surfaces in the axial direction on a cylindrical body, wherein V-shaped annular grooves with an opening angle V are provided at least in one of the end faces of the drive roll and the stop surface located opposite them on the body, V-shaped bearing shells with at approximately identical opening angles and approximately identical leg length are inserted into the annular grooves, the vertex diameters of the annular grooves differ from the vertex diameters of the bearing shells. Balls with a diameter matched to the opening width of the bearing shells are inserted into the bearing shells. At least one of the stop surfaces can be adjusted in the axial direction in order to clamp the drive roll in. Instead of different vertex diameters, different opening angles can also be provided for the annular grooves and opening angles for the bearing shells.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATIONS[0001]Federal Republic of Germany Priority Application 102 01 974.6, filed Jan. 19, 2002 including the specification, drawings, claims and abstract, is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The invention relates to a play-free rotary mounting for a drive roll held on stop surfaces in the axial direction on a cylindrical body.BACKGROUND OF THE INVENTION[0003]In precision instrument making there is often the need to provide rotatable drive rolls with which elements arranged in the interior of a housing can be adjusted. In such cases, the drive roll is intended to be actuated from outside and is fixed so as to limit displacement in the axial direction. Applications of such drive rolls include, for example, adjustment rings on objective lenses and focusing drives on binoculars.[0004]For reasons of space and cost, sliding bearings are normally used for the radial and axial mounting of the drive rolls. In...

AI Technical Summary

Benefits of technology

The invention is a play-free rotary mounting for a drive roll that can be adjusted in the axial and radial directions. The mounting is achieved by using V-shaped annular grooves and bearing shells with matching opening angles. The mounting is cost-effective and takes up minimal space. The technical effects of the invention include improved accuracy in mounting, reduced play in the mounting, and improved performance under restricted space conditions.

Problems solved by technology

In contrast, sliding bearings set without play are not free-running and have temperature-dependent and load-dependent torque differences and, as a result, their ability to be adjusted is considerably restricted.

For the installation of conventional ball bearings, the wall thicknesses available on the housing and in the drive roll are frequently inadequate.

In addition, in fine instrument making there is often inadequate space available for the installation of special prestressing means for setting bearing play.

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